The sweet smell of nectar is one of the features of a flower that attracts the Hummingbird moth. I agree that flowers would be more successful if they adapted to more than just one pollinator's needs. The reason I think this is because if there were only one pollinator for that particular flower, and the pollinator goes extinct, the flower will also go extinct. Whenever there are more than one pollinators for a flower, and one of them goes extinct, another one will be able to pollinate it
and ensure its survival. Additionally, having multiple pollinators increases the chances of successful pollination and reproduction for the flower.
Adapting to more than one pollinator's needs can also increase genetic diversity within the plant population. Different pollinators may have different preferences for certain traits, such as color, scent, or shape. By attracting a variety of pollinators, flowers can increase the chances of outcrossing and reduce the risks of inbreeding, ultimately leading to healthier and more resilient populations.
Overall, diversifying the pollinators that a flower can attract can increase its chances of survival and reproduction, ultimately benefiting both the plant and the pollinators themselves. It is a natural way for plants to adapt and thrive in a changing environment.